Natural SciencesPhysicsMathematical PhysicsQuantum MechanicsTheoretical PhysicsAngular MomentumQuantum Field TheoryQuantum OperatorsRelativistic Quantum MechanicsSchrödinger EquationSpin DynamicsAngular Momentum OperatorsAngular Momentum QuantizationOperatorsSpin Dynamics In RelativitySpin ObservablesSpin Physics
It is proposed to treat the spin of a particle phenomenologically by considering the particle as a small rotating sphere, the rotation of which is described by euler parameters. If the rotation is quantized in the space of the euler parameters, one obtains both integral and half-integral values for the spin. In this way one arrives at a formalism in which the spin components can be represented as differential operators in the Schroedinger representation.